Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d91f37f72ef229…

MALICIOUS

PDF

89.2 KB Created: 2021-07-18 05:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0208ffd79f8a9c02b17f6109eb7d52b SHA-1: 80494c730672ff4d12ea77c0230763e14c8d6940 SHA-256: 64d91f37f72ef229e92cf81bed3047e854740b4fbb79ce3633c26b05ad95dd65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing pages or download further malware. The presence of multiple links on disposable hosting and the use of UTM parameters further support a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/47ebad831616e1fb1bce99346ec5f75b/11896185038.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/vlq4m01bjtvkm5apbrc5a47s74/valizamolikufimem.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/56924ec12fcb88af15ddeafe3caa40d1/palepubaxiruxub.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fdc63977f3b92f01ed62ed7747ed9c22/riput.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf3948378---22617946869.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/mefeludenufodotakejos.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210624_EF94D732C038BDBD.pdfIn PDF document text
    • http://iwaandccareunion.com/clients/57137/File/20558925758.pdfIn PDF document text
    • http://yucekalipmakina.com/tsrm1/img/userfiles/file/tojub.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fd7c3d0490e8bdfc8c36eeee34a1d51c/ruzomi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b30caa637a---76276070508.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/tobivizogat.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/31113c8e1c9d477b28a8bf17c613222f/94397385882.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/92788604225.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84e8e4b47---13524614547.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/68764864730.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfd28f754---tefadebuv.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/dekujofubokevivoxa.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899c55a2e2c---93732589904.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607899141fa62---xaterubunukul.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072dab9ebf27---watunaji.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/lozusuxuvowawem.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/34294140271.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6ec9e57d327098ef897c77cda5f45866/34458267875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=melting+point+of+soy+candle+waxPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 10988 bytes
SHA-256: a8436b6f660adea1cd328cd4d891739de0aaf8f5be7ccebca6da21e66c22a64c
font_02_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 17420 bytes
SHA-256: a60d55bda07aab7661409bd03455f6e7058b72391a92018a5d722d8c16df3302

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